Bending copper pipe twice

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I need to unbend the end of a 15mm copper pipe to send it back under the floor boards. Was going to use a bending bar. Any thoughts
 
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I would but I can't access the straight section with a blow torch. It's central heating pipe.
 
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Would you think push fit is safe under floorboards

Well they're certainly used, personally I wouldn't feel comfortable with them, especially on heating pipes. Unbending the copper though could potentially work harden the copper.
 
Annealing will definitely soften copper but I don't know how it can be applied here.
Basically the metal is heated red hot (difficult to tell, naturally!) and then quenched in cold water.
John :)
 
Plastic pipe has been used on heating systems for probably 40 years. I haven't heard of any failure of pipe or fittings.
Copper will corrode through by various means.
 

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